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Journal articles on the topic 'High-performance cooling'

Author: Grafiati

Published: 4 June 2021

Last updated: 2 February 2022

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1

Yan, Zhibin, Mingliang Jin, Zhengguang Li, Guofu Zhou, and Lingling Shui. "Droplet-Based Microfluidic Thermal Management Methods for High Performance Electronic Devices." Micromachines 10, no. 2 (January 25, 2019): 89. http://dx.doi.org/10.3390/mi10020089.

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Advanced thermal management methods have been the key issues for the rapid development of the electronic industry following Moore’s law. Droplet-based microfluidic cooling technologies are considered as promising solutions to conquer the major challenges of high heat flux removal and nonuniform temperature distribution in confined spaces for high performance electronic devices. In this paper, we review the state-of-the-art droplet-based microfluidic cooling methods in the literature, including the basic theory of electrocapillarity, cooling applications of continuous electrowetting (CEW), electrowetting (EW) and electrowetting-on-dielectric (EWOD), and jumping droplet microfluidic liquid handling methods. The droplet-based microfluidic cooling methods have shown an attractive capability of microscale liquid manipulation and a relatively high heat flux removal for hot spots. Recommendations are made for further research to develop advanced liquid coolant materials and the optimization of system operation parameters.

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2

Colgan, E. G., B. Furman, M. Gaynes, N. LaBianca, J. H. Magerlein, R. Polastre, R. Bezama, K. Marston, and R. Schmidt. "High Performance and Subambient Silicon Microchannel Cooling." Journal of Heat Transfer 129, no. 8 (2007): 1046. http://dx.doi.org/10.1115/1.2724850.

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3

Maclaine-cross, I. L. "High-Performance Adiabatic Desiccant Open-Cooling Cycles." Journal of Solar Energy Engineering 107, no. 1 (February 1, 1985): 102–4. http://dx.doi.org/10.1115/1.3267637.

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4

Kang, T. S., and I. L. Maclaine-cross. "High Performance, Solid Desiccant, Open Cooling Cycles." Journal of Solar Energy Engineering 111, no. 2 (May 1, 1989): 176–83. http://dx.doi.org/10.1115/1.3268304.

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Solid desiccant, open cooling cycles use low temperature heat efficiently making them attractive for solar air conditioning. Advanced cycles using nearly reversible evaporative coolers have previously been proposed and shown to have high ideal performance. This parametric study shows that, with real components comparable to those used in studies of classical cycles, these open cycles can give more than twice the thermal coefficient of performance of a ventilation cycle.

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5

Dragoi, Mircea-Viorel, Dorin Mircea Rosca, Milena Flavia Folea, and Gheorghe Oancea. "A Fully Symmetrical High Performance Modular Milling Cutter." Symmetry 13, no. 3 (March 18, 2021): 496. http://dx.doi.org/10.3390/sym13030496.

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Milling cutters belong to a widely used category of cutting tools. In this category, modular milling cutters are a narrow niche, less studied, and developed. Usually, they are symmetrical cutting tools. A milling cutting tool that can be reconfigured due to its modularity and still keeps its symmetry becomes more interesting and useful for machining. The paper presents such a new concept in a computer aided design (CAD) model of a cutting tool based on some novel features. The tool itself is designed as a modular complex. The way the torque is transmitted from the shaft to the elementary cutters is an original one, as they are joined together based on a profiled assembling. The profile is one formed of filleted circular sectors and segments. The reaming of the elementary cutters has two sections each of them assuming a task: transmitting the torque, and precisely centring, respectively. The cooling system, which is a component of the tool, provides the cutting area with coolant both on the front and side face of the cutting tool. Some nozzles placed around the cutting tool send jets or curtains of coolant towards the side surface of the cutter, instead of parallel, as some existing solutions do. The source of the coolant supply is the inner cooling system of the machine tool. This provides the tool with coolant having proper features: high enough flow and pressure. The output of the research is a CAD-based model of the modular milling cutter with a high performance cooling system. All of this model’s elements were designed taking into account the design for manufacturing principles, so it will be possible to easily manufacture this tool. Several variants of milling cutters obtained by reconfiguring the complex tool are presented. Even if the tool is usually a symmetric complex, it can process asymmetric parts. Symmetry is intensively used to add some advantages to the modular cutting tool: balanced forces in the cutting process, the possibility of controlling the direction of the axial cutting force, and a good machinability of the grooves used to assemble the main parts of the cutting tool.

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6

Nakata, Naoki, Takashi Kuroki, Akio Fujibayashi, and Yoshio Utaka. "Cooling Performance of High Temperature Steel Plate in Intensive Cooling with High Water Flow Rate." Tetsu-to-Hagane 99, no. 11 (2013): 635–41. http://dx.doi.org/10.2355/tetsutohagane.99.635.

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7

Klocke, Fritz, Dieter Lung, Alexander Krämer, Tolga Cayli, and Hubertus Sangermann. "Potential of Modern Lubricoolant Strategies on Cutting Performance." Key Engineering Materials 554-557 (June 2013): 2062–71. http://dx.doi.org/10.4028/www.scientific.net/kem.554-557.2062.

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Besides developments in the area of dry machining and minimum quantity lubrication, the use of coolant lubricants is still essential when machining high alloyed steels or heat resistant materials like titanium and nickel based alloys. Experts agree that this fact will not change in the next decade. For this reason it is necessary to use coolant lubricants as effectively as possible to maximise their positive effect on productivity and process stability. High-performance cooling strategies like high-pressure cooling and cooling with cold gases (cryogenic cooling) have received increased attention in the last years. Through the targeted supply of coolant lubricants to the cutting site it is possible to decrease tool wear, increase cutting speeds, guarantee defined chip breakage and chip transport and – in terms of cryogenic cooling – waive part cleaning. This paper shows current research results in the above mentioned field. Since the performance of a high-pressure coolant lubricant supply in turning difficult to cut materials has been shown in many previous papers, this paper focuses on the quantification of the potential in turning different steels, namely quenched and tempered but also stainless steel in comparison to the conventional flood cooling. Since energy efficiency is very crucial, pressure and flow rate have to be adjusted carefully and in accordance with the cutting parameters to guarantee best results with less energy. Moreover the effects of cryogenic cooling will be evaluated in comparison to high-pressure cooling and conventional flood cooling. In latter field, cutting tests were carried out under variation of the flow rate in order to find the minimum required value for a certain machining task with the overall aim to prevent waste of the media used. Especially in cryogenic cooling technologies, many fundamental research regarding the working mechanisms but also further developments in cutting tool and machine tool technology are still necessary to make this technology ready for industrial use.

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8

Wang, Yunda, Ziyang Zhang, Tomoyasu Usui, Michael Benedict, Sakyo Hirose, Joseph Lee, Jamie Kalb, and David Schwartz. "A high-performance solid-state electrocaloric cooling system." Science 370, no. 6512 (October 1, 2020): 129–33. http://dx.doi.org/10.1126/science.aba2648.

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Electrocaloric (EC) cooling is an emerging technology that has broad potential to disrupt conventional air conditioning and refrigeration as well as electronics cooling applications. EC coolers can be highly efficient, solid state, and compact; have few moving parts; and contain no environmentally harmful or combustible refrigerants. We report a scalable, high-performance system architecture, demonstrated in a device that uses PbSc0.5Ta0.5O3 EC multilayer ceramic capacitors fabricated in a manufacturing-compatible process. We obtained a system temperature span of 5.2°C and a maximum heat flux of 135 milliwatts per square centimeter. This measured heat flux is more than four times higher than other EC cooling demonstrations, and the temperature lift is among the highest for EC systems that use ceramic multilayer capacitors.

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9

Brotz, Friedrich, Tobias Isermeyer, Conrad Pfender, and Thomas Heckenberger. "Cooling of high-performance batteries for hybrid vehicles." ATZ worldwide 109, no. 12 (December 2007): 13–16. http://dx.doi.org/10.1007/bf03224972.

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10

Simons, R. E. "The evolution of IBM high performance cooling technology." IEEE Transactions on Components, Packaging, and Manufacturing Technology: Part A 18, no. 4 (1995): 805–11. http://dx.doi.org/10.1109/95.477467.

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11

Suichi, Takahiro, Atsushi Ishikawa, and Kenji Tsuruta. "High-Performance Radiative Cooling Device under Sunlight Irradiation." Proceedings of The Computational Mechanics Conference 2016.29 (2016): 4_123. http://dx.doi.org/10.1299/jsmecmd.2016.29.4_123.

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12

Chitrov, E. V., V. Z. Kanter, S. B. Pokhodyaev, and Yu I. Anoshkin. "Air cooling equipment with high performance and reliability." Chemistry and Technology of Fuels and Oils 43, no. 5 (September 2007): 376–81. http://dx.doi.org/10.1007/s10553-007-0066-y.

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13

Courtois, Hervé, Hung Q. Nguyen, Clemens B. Winkelmann, and Jukka P. Pekola. "High-performance electronic cooling with superconducting tunnel junctions." Comptes Rendus Physique 17, no. 10 (December 2016): 1139–45. http://dx.doi.org/10.1016/j.crhy.2016.08.010.

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14

Schöffmann, Wolfgang, Helfried Sorger, Franz Zieher, and Michael Erich Hammer. "High-performance Engine Features Architecture, Cooling and Validation." MTZ worldwide 78, no. 3 (February 15, 2017): 40–45. http://dx.doi.org/10.1007/s38313-016-0177-0.

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15

Levin, I. I., A. M. Fedorov, Y. I. Doronchenko, and M. K. Raskladkin. "ADVANCED HIGH-PERFORMANCE RECONFIGURABLE COMPUTERS WITH IMMERSION COOLING." IZVESTIYA SFedU. ENGINEERING SCIENCES, no. 7 (February 21, 2021): 6–19. http://dx.doi.org/10.18522/2311-3103-2020-7-6-19.

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16

Harrington, Mark K., Marcus A. McWaters, David G. Bogard, Christopher A. Lemmon, and Karen A. Thole. "Full-Coverage Film Cooling With Short Normal Injection Holes." Journal of Turbomachinery 123, no. 4 (February 1, 2001): 798–805. http://dx.doi.org/10.1115/1.1400111.

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An experimental and computational investigation was conducted on the film cooling adiabatic effectiveness of a flat plate with full coverage film cooling. The full coverage film cooling array was comprised of ten rows of coolant holes, arranged in a staggered pattern, with short L/D=1, normal coolant holes. A single row of cooland holes was also examined to determine the accuracy of a superposition prediction of the full coverage adiabatic effectiveness performance. Large density coolant jets and high mainstream turbulence conditions were utilized to simulate realistic engine conditions. High-resolution adiabatic effectiveness measurements were obtained using infrared imaging techniques and a large-scale flat plate model. Optimum adiabatic effectiveness was found to occur for a blowing ratio of M=0.65. At this blowing ratio separation of the coolant jet immediately downstream of the hole was observed. For M=0.65, the high mainstream turbulence decreased the spatially averaged effectiveness level by 12 percent. The high mainstream turbulence produced a larger effect for lower blowing ratios. The superposition model based on single row effectiveness results over-predicted the full coverage effectiveness levels.

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17

Newkirk, Joseph W., and F. Frank Liou. "High Performance Materials by Laser Deposition." Materials Science Forum 783-786 (May 2014): 2365–69. http://dx.doi.org/10.4028/www.scientific.net/msf.783-786.2365.

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Additive Manufacturing using laser deposition has a great deal of attractiveness as a fabrication technique for metals and alloys. The combination of a high heat input, small molten volume, and incremental addition also is well suited for the production of high performance alloys and composites. The high cooling rates inherent in the process produces refined microstructures, leading to excellent as-deposited mechanical properties in conventional alloys. The high heating rates and cooling rates potentially lends itself to structurally amorphous alloys, functionally gradient materials, and nanostructured materials, among other more exotic metallic materials. By monitoring the process a map of the quality of the build can be recorded for quality assurance and validation. Flaws detected during fabrication can then be repaired in-situ. Realizing this potential will require a combination of modeling, experimental validation, and new design paradigms. Together this will lead to the greatest properties and functionalities in future products.

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18

Krämer, A., Dieter Lung, and Fritz Klocke. "High Performance Cutting of Aerospace Materials." Advanced Materials Research 498 (April 2012): 127–32. http://dx.doi.org/10.4028/www.scientific.net/amr.498.127.

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Titanium and nickel-based alloys belong to the group of difficult-to-cut materials. The machining of these high-temperature alloys is characterized by low productivity and low process stability as a result of their physical and mechanical properties. Major problems during the machining of these materials are low applicable cutting speeds due to excessive tool wear, long machining times, and thus high manufacturing costs, as well as the formation of ribbon and snarled chips. Under these conditions automation of the production process is limited. This paper deals with strategies to improve machinability of titanium and nickel-based alloys. Using the example of the nickel-based alloy Inconel 718 high performance cutting with advanced cutting materials, such as PCBN and cutting ceramics, is presented. Afterwards the influence of different cooling strategies, like high-pressure lubricoolant supply and cryogenic cooling, during machining of TiAl6V4 is shown.

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19

Mao, Jun, Hangtian Zhu, Zhiwei Ding, Zihang Liu, Geethal Amila Gamage, Gang Chen, and Zhifeng Ren. "High thermoelectric cooling performance of n-type Mg3Bi2-based materials." Science 365, no. 6452 (July 18, 2019): 495–98. http://dx.doi.org/10.1126/science.aax7792.

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Thermoelectric materials have a large Peltier effect, making them attractive for solid-state cooling applications. Bismuth telluride (Bi2Te3)–based alloys have remained the state-of-the-art room-temperature materials for many decades. However, cost partially limited wider use of thermoelectric cooling devices because of the large amounts of expensive tellurium required. We report n-type magnesium bismuthide (Mg3Bi2)–based materials with a peak figure of merit (ZT) of ~0.9 at 350 kelvin, which is comparable to the commercial bismuth telluride selenide (Bi2Te3–xSex) but much cheaper. A cooling device made of our material and p-type bismuth antimony telluride (Bi0.5Sb1.5Te3) has produced a large temperature difference of ~91 kelvin at the hot-side temperature of 350 kelvin. n-type Mg3Bi2-based materials are promising for thermoelectric cooling applications.

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20

Park, Jaehyun, Jaemun Choi, Changwoo Han, and Heesung Park. "Effect of Liquid Coolant Channel Configuration on Cooling Performance of High Power Electronics." Journal of the Korean Society for Precision Engineering 38, no. 1 (January 1, 2021): 29–33. http://dx.doi.org/10.7736/jkspe.020.051.

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21

Hou, Huilong, Emrah Simsek, Tao Ma, Nathan S. Johnson, Suxin Qian, Cheikh Cissé, Drew Stasak, et al. "Fatigue-resistant high-performance elastocaloric materials made by additive manufacturing." Science 366, no. 6469 (November 28, 2019): 1116–21. http://dx.doi.org/10.1126/science.aax7616.

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Elastocaloric cooling, a solid-state cooling technology, exploits the latent heat released and absorbed by stress-induced phase transformations. Hysteresis associated with transformation, however, is detrimental to efficient energy conversion and functional durability. We have created thermodynamically efficient, low-hysteresis elastocaloric cooling materials by means of additive manufacturing of nickel-titanium. The use of a localized molten environment and near-eutectic mixing of elemental powders has led to the formation of nanocomposite microstructures composed of a nickel-rich intermetallic compound interspersed among a binary alloy matrix. The microstructure allowed extremely small hysteresis in quasi-linear stress-strain behaviors—enhancing the materials efficiency by a factor of four to seven—and repeatable elastocaloric performance over 1 million cycles. Implementing additive manufacturing to elastocaloric cooling materials enables distinct microstructure control of high-performance metallic refrigerants with long fatigue life.

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22

Chee, Yeow Meng, Tuvi Etzion, Han Mao Kiah, and Alexander Vardy. "Cooling Codes: Thermal-Management Coding for High-Performance Interconnects." IEEE Transactions on Information Theory 64, no. 4 (April 2018): 3062–85. http://dx.doi.org/10.1109/tit.2017.2771245.

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23

Mrugalski, Roland, and Piotr Osiak. "High performance machining of aluminum alloys with MQL cooling." Mechanik, no. 10 (October 2016): 1380–81. http://dx.doi.org/10.17814/mechanik.2016.10.371.

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24

Wu, Di, Zhen Wang, Gui Lu, and Xiaofeng Peng. "High-Performance Air Cooling Condenser With Liquid–Vapor Separation." Heat Transfer Engineering 31, no. 12 (October 2010): 973–80. http://dx.doi.org/10.1080/01457631003638952.

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25

Aravelli, Aparna, Singiresu S. Rao, and Hari K. Adluru. "Multiobjective Design Optimization of Microchannel Cooling System Using High Performance Thermal Vias in LTCC Substrates." Journal of Microelectronics and Electronic Packaging 10, no. 1 (January 1, 2013): 40–47. http://dx.doi.org/10.4071/imaps.360.

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Increased heat generation in semiconductor devices for demanding applications leads to the investigation of highly efficient cooling solutions. Effective options for thermal management include passing of cooling liquid through the microchannel heat sink and using highly conductive materials. In the author's previous work, experimental and computational analyses were performed on LTCC substrates using embedded silver vias and silver columns forming microchannels. This novel technique of embedding silver vias along with forced convection using a coolant resulted in higher heat transfer rates. The present work investigates the design optimization of this cooling system (microheat exchanger) using systems optimization theory. A new multiobjective optimization problem was formulated for the heat transfer in the LTCC model using the log mean temperature difference (LMTD) method of heat exchangers. The goal is to maximize the total heat transferred and to minimize the coolant pumping power. Structural and thermal design variables are considered to meet the manufacturability and energy requirements. Pressure loss and volume of the silver metal are used as constraints. A hybrid optimization technique using sequential quadratic programming (SQP) and branch and bound method of integer programming has been developed to solve the microheat exchanger problem. The optimal design is presented and sensitivity analysis results are discussed.

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26

Wang, Yangang, Yibo Wu, Xiaoping Dai, Steve Jones, and Guoyou Liu. "Investigation of Automotive Power Semiconductor Module Operates at Elevated Cooling Temperature." Additional Conferences (Device Packaging, HiTEC, HiTEN, and CICMT) 2015, HiTEN (January 1, 2015): 000154–60. http://dx.doi.org/10.4071/hiten-session5-paper5_1.

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The degradation of performance and reliability of power semiconductor module with increment of temperature is an important issue to deal with in Hybrid and Electric Vehicles (HEV/EV) application. The high ambient and cooling temperatures are challenges to HEV/EV modules as the automotive industry is interested in cooling power electric system by sharing with engine's high temperature coolant. The elimination of low temperature cooling circuit has significant benefits to cost and volume/weight. However, the performance and reliability will be worsened to a large degree which may affect the feasibility of module application. In this work, an investigation is done to evaluate the electrical, thermal performance and reliability of a standard direct liquid cooled automotive IGBT module operates at 105°C coolant.

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27

Kang, Seung-Gu, Hong-Jun Choi, Jin-Woo Ahn, Jae-Hyung Park, Jong-Myon Kim, and Cheol-Hong Kim. "Analysis on the Cooling Efficiency of High-Performance Multicore Processors according to Cooling Methods." Journal of the Korea Society of Computer and Information 16, no. 7 (July 31, 2011): 1–11. http://dx.doi.org/10.9708/jksci.2011.16.7.001.

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28

Patil, Mahesh, Satyam Panchal, Namwon Kim, and Moo-Yeon Lee. "Cooling Performance Characteristics of 20 Ah Lithium-Ion Pouch Cell with Cold Plates along Both Surfaces." Energies 11, no. 10 (September 25, 2018): 2550. http://dx.doi.org/10.3390/en11102550.

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Temperature control of the lithium-ion pouch cells is crucial for smooth operation, longevity and enhanced safety in the battery-operated electric vehicles. Investigating the thermal behavior of lithium-ion pouch cells and optimizing the cooling performance are required to accomplish better performance, long life, and enhanced safety. In the present study, the cooling performance characteristics of 20 Ah lithium-ion pouch cell with cold plates along both surfaces are investigated by varying the inlet coolant mass flow rates and the inlet coolant temperatures. The inlet coolant mass flow rate is varied from 0.000833 kg/s to 0.003333 kg/s, and the inlet coolant temperature is varied from 5 °C to 35 °C. In addition, the effects of the cold plate geometry parameter on cooling performance of 20 Ah lithium-ion pouch cell are studied by varying the number of the channels from 4 to 10. The maximum temperature and difference between the maximum and the minimum temperatures are considered as important criteria for cooling performance evaluation of the 20 Ah lithium-ion pouch cell with cold plates along both surfaces. The cooling energy efficiency parameter (β) and the pressure drop for 20 Ah lithium-ion pouch cell with cold plates along both surfaces are also reported. The study shows that enhanced cooling energy efficiency is accompanied with low inlet coolant temperature, low inlet coolant mass flow rate, and a high number of the cooling channels. As a result, the temperature distribution, the pressure drop, and the cooling energy efficiency parameter (β) of the 20 Ah lithium-ion pouch cell with cold plates along both surfaces are provided, and could be applied for optimizing the cooling performances of the thermal management system for lithium-ion batteries in electric vehicles.

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29

Wang, Chen, Chunhua Wang, and Jingzhou Zhang. "Parametric Studies of Laminated Cooling Configurations: Overall Cooling Effectiveness." International Journal of Aerospace Engineering 2021 (February 10, 2021): 1–15. http://dx.doi.org/10.1155/2021/6656804.

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Combing the advantages of film cooling, impingement cooling, and enhanced cooling by pin fins, laminated cooling is attracting more and more attention. This study investigates the effects of geometric and thermodynamic parameters on overall cooling effectiveness of laminated configuration, and model experiments were carried out to validate the numerical results. It is found that the increases in film cooling hole diameter and pin fin diameter both result in the increase in cooling effectiveness, but the increases in impingement hole diameter, impingement height, and spanwise hole pitch degrade the cooling performance. The increase of the coolant flow rate causes the increase in cooling efficiency, but this effect becomes weaker at a high coolant flow rate. The coolant-to-mainstream density ratio has no obvious effect on cooling effectiveness but affects wall temperature obviously. Moreover, based on the numerical results, an empirical correlation is developed to predict the overall cooling efficiency in a specific range, and a genetic algorithm is applied to determine the empirical parameters. Compared with the numerical results, the mean prediction error (relative value) of the correlation can reach 8.3%.

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30

McLean, Christopher, Cengiz Camci, and Boris Glezer. "Mainstream Aerodynamic Effects Due to Wheelspace Coolant Injection in a High-Pressure Turbine Stage: Part I—Aerodynamic Measurements in the Stationary Frame." Journal of Turbomachinery 123, no. 4 (February 1, 2001): 687–96. http://dx.doi.org/10.1115/1.1401026.

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The relative aerodynamic and performance effects associated with rotor–NGV gap coolant injections were investigated in the Axial Flow Turbine Research Facility (AFTRF) of the Pennsylvania State University. This study quantifies the effects of the coolant injection on the aerodynamic performance of the turbine for radial cooling, impingement cooling in the wheelspace cavity and root injection. Overall, it was found that even a small quantity (1 percent) of cooling air can have significant effects on the performance character and exit conditions of the high pressure stage. Parameters such as the total-to-total efficiency, total pressure loss coefficient, and three-dimensional velocity field show local changes in excess of 5, 2, and 15 percent, respectively. It is clear that the cooling air disturbs the inlet end-wall boundary layer to the rotor and modifies secondary flow development, thereby resulting in large changes in turbine exit conditions.

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31

Wang, Miao, Jin Wang, Jiajin Wang, and Cheng Shi. "Contrastive analysis of cooling performance between a high-level water collecting cooling tower and a typical cooling tower." Journal of Thermal Science 27, no. 1 (January 31, 2018): 39–47. http://dx.doi.org/10.1007/s11630-018-0982-7.

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32

Hou, Rui, Fengbo Wen, Tao Cui, Xiaolei Tang, and Songtao Wang. "Numerical investigation on the improved three-hole cooling unit with the trench." International Journal of Numerical Methods for Heat & Fluid Flow 29, no. 3 (March 4, 2019): 890–914. http://dx.doi.org/10.1108/hff-06-2018-0344.

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Purpose This study aims to introduce a three-hole cooling unit to improve downstream cooling performance by jet interaction and coalescence at a lower manufacture cost. Design/methodology/approach A new three-hole cooling unit is proposed. Reynolds-averaged Navier–Stokes (RANS) simulation is performed in the present study. The CFD package ANSYS CFX is used to predict film-cooling effectiveness and flow fields. Findings The results show that, at pitch ratio P/D = 3, Case 4 configuration with a round hole upstream and two trenched holes downstream can obtain a high cooling performance at a lower manufacture cost, especially at the higher turbulence. Considering the effect of increased pitch ratio, Case 6 configurations of three staggered trenched holes show a superior downstream cooling performance than Case 4 configurations. Case 6 configurations have the potential of achieving a high cooling performance with a reduced number of holes and less coolant flow. Research limitations/implications The application of these cooling units in the turbine passage will be conducted in the future. The more detailed flow field will be simulated by large eddy simulation in the following research. Practical implications The round and trenched cooling holes have been proved to be achievable in the manufacture. This combined three-hole cooling unit will give the opportunity to increase turbine inlet temperature further. Originality/value Both cooling performance and practical manufacture are taken into account. This cooling scheme will give a superior surface protection on the hot components.

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33

Wang, Fu Jen, Kuei I. Tsai, Tong Bou Chang, Hao Chuan Lee, and Yu Jun Lin. "Experimental Evaluation of System Performance for a Machine Tool Cooler Using Inverter Driven Control." Advanced Materials Research 189-193 (February 2011): 4073–76. http://dx.doi.org/10.4028/www.scientific.net/amr.189-193.4073.

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Highly accurate manufacture in machining industry cannot be achieved without precise temperature control of the cooling water. However, the machine tool coolers are facing the control hunting of coolant temperature and the dramatic variation of heat load in high-accuracy machining. In this study, experimental investigation on inverter driven compressor for capacity control has been proposed. Effects of using capillary tube and thermostatic expansion valve along with inverter driven control scheme have been investigated comprehensively. Cooling performance and power consumption of the cooler system have been measured at different frequency (hertz) of inverter under specific cooling water temperature. The experimental results reveal that the inverter driven cooler is cost-effective and energy-efficient for high-precision machine tool cooling.

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34

Mert, Serdar, Halit Yaşar, Ufuk Durmaz, Adnan Topuz, Alper Yeter, and Tahsin Engin. "An experimental study on cooling performance of a car radiator using Al2O3 - ethylene glycol/water nanofluid." Thermal Science, no. 00 (2020): 179. http://dx.doi.org/10.2298/tsci190630179m.

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Nanofluids have high thermal conductivity and can be used as vehicle engine coolant. In this article, the effects of Al2O3 nanoparticles to an engine coolant were experimentally investigated and the results were compared with the results of the original coolant including 50% ethylene glycol and 50% water mixture. The nanofluid was prepared by adding 0.5% Al2O3 nanoparticles by volume. The inlet temperature of the coolant was held constant at 95 Celsius. The tests were carried out at the air inlet temperatures between 23.4-28.6 ?C, the air velocity between 1.7-4.3 m/s, the cooling power between 2.5-15 kW and the cooling fluid flow rates between 10-25 L/min. The results show that nanoparticles increase the cooling performance of the engine radiator. By using Al2O3 nanoparticles, cooling power of the radiator has increased up to 17.46% compared to original case.

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35

Annerel, Emmanuel, and Luc Taerwe. "Combined Effects on Residual Strength of a High Performance Concrete Exposed to Fire." Key Engineering Materials 711 (September 2016): 465–71. http://dx.doi.org/10.4028/www.scientific.net/kem.711.465.

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Concrete structures exposed to fire suffer from damage, but can remain a certain degree of residual strength. International research has shown that the compressive strength of concrete decreases not only with temperature, but also by the way of cooling and the storage conditions after fire. Fast cooling introduces a thermal shock which, based on experiments by the authors, could result in a 30% additional strength loss with respect to the loss during heating. When storing the concrete after the fire in air or under water, additional strength losses of about 20-30 % are found within 14 days after the fire. In this paper it is investigated for a high performance concrete what the combined effect is of heating, cooling and storage. One of the conclusions – but with respect to the specific test conditions (e.g. slow heating, 550°C max, pre-dried samples) – is that superposing both expected strength losses of about 30% in case a fast cooling is followed by a period of post-cooling storage results in too conservative strength estimations. It is deemed that the cracks resulting from fast cooling, will act as expansion chambers for the newly produced portlandite, thus strongly reducing additional stresses, which results in expected lesser damage.

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MORI, Shohei, Kenichiro TAKEISHI, Masaharu KOMIYAMA, Yutaka ODA, and Takeshi NISHIGAKI. "1115 Study on mixing Phenomena of High Performance Film Cooling." Proceedings of Conference of Kansai Branch 2010.85 (2010): _11–15_. http://dx.doi.org/10.1299/jsmekansai.2010.85._11-15_.

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Kovacevic, R., C. Cherukuthota, and R. Mohan. "Improving Milling Performance with High Pressure Waterjet Assisted Cooling / Lubrication." Journal of Engineering for Industry 117, no. 3 (August 1, 1995): 331–39. http://dx.doi.org/10.1115/1.2804338.

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During machining, due to relative motion between tool and workpiece, severe thermal/frictional conditions exist at the tool-chip interface. Metal machining processes can be more efficient in terms of increasing the metal removal rate and lengthening tool life, if the thermal/frictional conditions are controlled effectively. A high pressure waterjet assisted coolant/lubricant system that can be used in conjunction with rotary tools (e.g., face milling) is developed here. The performance of this system is evaluated in terms of cutting force, surface quality, tool wear, and chip shape. The improvement in the effectiveness of the developed system with increase in water pressure and orifice diameter is also investigated. Stochastic modeling of the surface profile is performed to obtain more information about the role of waterjet in the machining process.

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Hwang, Ki-Young, and You-Il Kim. "Research Activities of Transpiration Cooling for High-Performance Flight Engines." Journal of the Korean Society for Aeronautical & Space Sciences 39, no. 10 (October 1, 2011): 966–78. http://dx.doi.org/10.5139/jksas.2011.39.10.966.

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39

Kleiner, M. B., S. A. Kuhn, and K. Haberger. "High performance forced air cooling scheme employing microchannel heat exchangers." IEEE Transactions on Components, Packaging, and Manufacturing Technology: Part A 18, no. 4 (1995): 795–804. http://dx.doi.org/10.1109/95.477466.

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40

Koh, D., H. Yeom, Y. Hong, and K. Lee. "Performance Tests of High Temperature Superconducting Power Cable Cooling System." IEEE Transactions on Appiled Superconductivity 14, no. 2 (June 2004): 1746–49. http://dx.doi.org/10.1109/tasc.2004.831066.

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41

Rephaeli, Eden, Aaswath Raman, and Shanhui Fan. "Ultrabroadband Photonic Structures To Achieve High-Performance Daytime Radiative Cooling." Nano Letters 13, no. 4 (March 11, 2013): 1457–61. http://dx.doi.org/10.1021/nl4004283.

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Hanzawa, Daiki, Kyosuke Katsumata, and Tomio Ookawa. "309 A study on high-performance cooling using porous microchallnel." Proceedings of Ibaraki District Conference 2013.21 (2013): 119–20. http://dx.doi.org/10.1299/jsmeibaraki.2013.21.119.

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43

Kirsch, Benjamin, Stephan Basten, Hans Hasse, and Jan C. Aurich. "Sub-zero cooling: A novel strategy for high performance cutting." CIRP Annals 67, no. 1 (2018): 95–98. http://dx.doi.org/10.1016/j.cirp.2018.04.060.

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44

Parida, Pritish R., Srinath V. Ekkad, and Khai Ngo. "Impingement-based high performance cooling configurations for automotive power converters." International Journal of Heat and Mass Transfer 55, no. 4 (January 2012): 834–47. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2011.10.024.

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Nakane, H., A. Maekawa, E. Akita, K. Akagi, T. Nakano, S. Nishimoto, S. Hashimoto, T. Shinohara, and H. Uehara. "The Development of High-Performance Leaf Seals." Journal of Engineering for Gas Turbines and Power 126, no. 2 (April 1, 2004): 342–50. http://dx.doi.org/10.1115/1.1615257.

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Recently, from the environmental point of view, demand for a combined cycle plant is increasing, and superior gas turbine performance is being rapidly promoted at the same time. As one of the key technologies for superior performance, reduction of secondary air leakage, which is necessary for blade cooling and bearing sealing, is required. Especially, reduction of air leakage through rotating parts and stationary parts clearance is critical.

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You, Peng, Xiong Li, Yijia Huang, Xiaoliang Ma, Mingbo Pu, Yinghui Guo, and Xiangang Luo. "High-Performance Multilayer Radiative Cooling Films Designed with Flexible Hybrid Optimization Strategy." Materials 13, no. 13 (June 27, 2020): 2885. http://dx.doi.org/10.3390/ma13132885.

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Despite their great potential for energy-saving applications, it is still challenging to design passive radiative cooling (RC) materials with simultaneous high performance and simple structures based on traditional design philosophy. To solve the contradiction between optimization speed and corresponding performance, we present a flexible hybrid optimization strategy based on a genetic algorithm (GA) in conjunction with the transfer matrix method and introducing the calculation of radiative cooling power density in the evaluation function of the GA. As a demonstration, an optimized coating with 1.5-μm-overlapping MgF2 and Si3N4 layers on top of a silver film was numerically designed. Based on a detailed analysis of the material’s electromagnetic properties and cooling performance, this coating achieved a radiative cooling power density of 62 W/m2 and a temperature reduction of 6.8 °C at an ambient temperature of 300 K. Our optimization strategy may have special significance in the design of high-performance RC materials or other multi-spectral engineering materials with simple structures.

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Qiang, Xuhong, Nianduo Wu, Xu Jiang, Frans Bijlaard, and Henk Kolstein. "Performance assessment on high strength steel endplate connections after fire." Journal of Structural Fire Engineering 8, no. 2 (June 12, 2017): 202–14. http://dx.doi.org/10.1108/jsfe-11-2016-0018.

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Purpose This study aims to reveal more information and understanding on performance and failure mechanisms of high strength steel endplate connections after fire. Design/methodology/approach An experimental and numerical study on seven endplate connections after cooling down from fire temperature of 550°C has been carried out and reported herein. Moreover, the provisions of European design standard for steel structures, Eurocode 3, were validated with test results of high strength steel endplate connections. Findings In endplate connections, a proper design using a thinner high strength steel endplate can achieve the same failure mode, similar residual load bearing capacity and comparable or even higher rotation capacity after cooling down from fire. It is found that high strength steel endplate connection can regain more than 90 per cent of its original load bearing capacity after cooling down from fire temperature of 550°C. Originality/value The post-fire performance of high strength steel endplate connection has been reported. The accuracy of Eurocode 3 for endplate connections is validated against test results.

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Ismagilov, Flur, Irek Khayrullin, Vyacheslav Vavilov, Ruslan Karimov, and Anton Gorbunov. "High-Performance Generator for a New Generation of Aircrafts." International Journal of Electrical and Computer Engineering (IJECE) 7, no. 5 (October 1, 2017): 2338. http://dx.doi.org/10.11591/ijece.v7i5.pp2338-2348.

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The article describes multidisciplinary design process of high-performance electric generator for advanced aircrafts by analytical methods and computer modeling techniques (electromagnetic, thermal and mechanical calculations). New technical solutions used in its development are described. The main ideas are revealed of the method of EG voltage stabilization we used. To improve the heat dissipation efficiency, we have developed a new cooling system, and provide its study and description in this paper. The advantages of this cooling system include the fact that EG is made with dry, uncooled rotor. This allowed eliminating additional pumps, and significantly reducing the size of CSD. According to the results of our study, we created an experimental full capacity layout, and its studies are also provided in this paper.

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Leroy, A., B. Bhatia, C. C. Kelsall, A. Castillejo-Cuberos, M. Di Capua H., L. Zhao, L. Zhang, A. M. Guzman, and E. N. Wang. "High-performance subambient radiative cooling enabled by optically selective and thermally insulating polyethylene aerogel." Science Advances 5, no. 10 (October 2019): eaat9480. http://dx.doi.org/10.1126/sciadv.aat9480.

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Recent progress in passive radiative cooling technologies has substantially improved cooling performance under direct sunlight. Yet, experimental demonstrations of daytime radiative cooling still severely underperform in comparison with the theoretical potential due to considerable solar absorption and poor thermal insulation at the emitter. In this work, we developed polyethylene aerogel (PEA)—a solar-reflecting (92.2% solar weighted reflectance at 6 mm thick), infrared-transparent (79.9% transmittance between 8 and 13 μm at 6 mm thick), and low-thermal-conductivity (kPEA = 28 mW/mK) material that can be integrated with existing emitters to address these challenges. Using an experimental setup that includes the custom-fabricated PEA, we demonstrate a daytime ambient temperature cooling power of 96 W/m2 and passive cooling up to 13°C below ambient temperature around solar noon. This work could greatly improve the performance of existing passive radiative coolers for air conditioning and portable refrigeration applications.

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Li, Jing, Xiang Hua Liu, Bing Xin Wang, Jing Bao Lian, and Wen Guang Wang. "Development of 360 MPa Grade Heavy Plate with High Performance." Advanced Materials Research 299-300 (July 2011): 242–45. http://dx.doi.org/10.4028/www.scientific.net/amr.299-300.242.

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360MPa grade heavy plate with high performance was developed through TMCP technology. By means of tensile and charpy impact tests and optical microscopy, the effects of processing parameters on final microstructure and properties of the steel have been studied, such as start rolling temperature in austenite non-recrystallization region and cooling rate. In order to obtain better mechanical properties, the optimization of the rolling process in an experiment rolling mill has been carried out. It has been found that the tensile strength of HSLA heavy plate are significantly improved by decreasing the start rolling temperature and increasing of the cooling rate, but the impact properties present the reverse law.

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